Automatic feed water valve for boilers



May 1l, 1937. R. MAHLER AUTOMATIC FEED WATER VALVE FOR BOILERS Filed June 5,. 1936 Patented May 11, 1937 UNITED STATES PATENT OFFICE AUTOMATIC FEED WATER VALVE FOR BOILERS Robert Mahler, Vienna, Austria lil-:ISSUED 1 Claim.

In known feed valves fory boilers, which are regulated by a float or like means in connection with the boiler pressure, the disadvantage frequently occurs that incrustations form on the 5 valve, giving rise to trouble in the boiler feeding. vThese boiler incrustations or scale, as is well known, are not deposited in considerable quantity until the water has reached a certain critical temperature; this temperature can nevertheless,

l with existing feed valves, occur around the valve seat due to the fact that the heat rising from the water, reaches the valve. According to the present invention, this drawback is eliminated in that between the seat of the feed water valve l and the mouth of the feed water supply channel, there is arranged in the boiler a vertical or steep-upwardly inclined length of tube, the length of which is considerably greater than the diameter through which feed water is forced to 20 flow upwardly into the boiler in order to prevent the deposit of incrustations on the seat of the valve. Since by reason of the arrangement of the tube connected to the valve casing according to the present invention, the inlet to the 25 boiler is situated at a considerably higher level than the seat of the valve, the heat from the boiler water cannot reach the seat of the valve and the latter is thus always surrounded by cool water. In this way any considerable incrusta- 30 tion which interferes with the function of the valve is safely avoided. It is already known from British specification No. 2,896, of 1909, to use, in feed water valves for boilers valves which were regulated only by hand, wherein one end of a 35 bent member connecting the feed water inlet Valve and the return valve, as for instance, a comparatively short piece of tube, is arranged vertically, but this did not prevent the deposit of scale or incrustations around the seat of the 40 feed water valve in any way.

In the accompanying drawing is illustrated a constructional form of the present invention, wherein:

Figure 1 shows a cross-section of a construc- 45 tional form of the new feed valve and Fig. 2 a

side elevation thereof.

The valve casing consists of a lid member I and a bowl-shaped body 2 adapted to be readily secured to or released from the lid I, for instance 5o by a stirrup or like member 4 tightened up by means of a screw 3 and forming a tight joint by means of a washer 2 placed between the body and the lid. On one side of the lid I is provided an extension member 5 which carries the con- 55 necting piece 6 for the feed water pipe. This connecting piece 6 is secured in position by means of a nut 'I. 8 represents the valve seat. The other side of the lid I is provided with a bore to receive a tube 9 arranged vertically which tube may be made in one piece with the. actual supporting body I0 which is connected to the boiler. The supporting body may be closed by means of a screw-threaded plug or cover II or the like. The tubular extension 9 is held in place by means of a screw-threaded union or like member I2.

The oat, which is not shown in the drawing, is connected to an arm I3, which is connected by means of a fork-shaped member I4 to a connecting rod I5 which in turn is connected by means of another fork-shaped member I6 to a two-arm lever I1, the other end of which latter carries the valve proper I8. The cone-shaped closing surface of this valve is directed upwardly so that the stream of cold water entering can easily wash away any incrustation, scale or other foreign matter.

The water first flows past the valve seat into the bowl 2 and then through the tube 9 upwardly into the boiler. In this manner thev heat from the boiler water cannot reach the seat of the valve, so that none or only a nominal amount of incrustation is formed on the latter. Any scale or incrustation which may be deposited in the chamber through which the feed water enters the feed inlet to the boiler collects in the bowl 2 and can be removed after said bowl has been dismantled. The easily removable bowl 2 also renders the seat of the valve and the connecting rods easily accessible.

I claimt- An automatic feed water valve for boilers comprising, in combination, a float in the boiler, a casing directly connected to the boiler below water level, a tube leading substantially vertically downward from said casing, an enlarged chamber connected to said tube and having a considerably larger diameter than said tube, a feed water valve in said enlarged chamber, the vertical tube as well as the seat of the feed water valve ending in the cover of said enlarged chamber, an easily detachable bottom to said enlarged chamber and a lever connection leading directly from the n oat through said vertical connecting tube to the feed water valve, the valve seat being arranged so that the stream of water from the water pipe line through the valve is directed downwardly, the valve seat being located at the side of the tube and above the bottom of the chamber.

ROBERT MAHLER. 

